Liquid crystal display device

ABSTRACT

A liquid crystal display device includes a liquid crystal display element, a frame member having a frame-shaped part which is arranged at a displaying surface side of the liquid crystal display element and having a display window exposing a displaying surface of the liquid crystal display element, and a side wall which is extended from the frame-shaped part along a thickness direction of the liquid crystal display element. A light source is arranged opposite to another surface of the liquid crystal display element which is opposite to the displaying surface thereof and irradiates the another surface of the liquid crystal display element with illumination light. A housing member which houses the light source has a main surface opposite to a frame-shaped part of the frame member and a side wall formed at a periphery of the main surface thereof.

CROSS REFERENCE TO RELATED APPLICATION

[0001] This is a divisional of U.S. application Ser. No. 09/797,598,filed Mar. 5, 2001, the subject matter of which is incorporated byreference herein and is related to another divisional of U.S.application Ser. No. 09/797,598 which is filed on even date herewith.

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relate to a liquid crystal display deviceused for a personal computer, a work station, or the like, andparticularly to a technique effective in reduction in picture framewidth of a liquid crystal display device, and in reduction in thicknessthereof.

[0004] 2. Description of the Related Art

[0005] An STN (Super Twisted Nematic) system or a TFT (Thin FilmTransistor) liquid crystal display module is widely used as a displaydevice of a notebook-size personal computer or the like.

[0006] The liquid crystal display module is constituted by a liquidcrystal display panel in which a driving circuit portion is arranged atits periphery and a backlight unit for illuminating the liquid crystaldisplay panel.

[0007] The backlight unit is constituted by, for example, a light guidebody for guiding light radiated from a light source to a portion distantfrom the light source and for uniformly irradiating the whole liquidcrystal display panel with the light, a cold-cathode fluorescent lamp asa linear light source arranged in the vicinity of the light guide body,along a side of the light guide body, and in parallel with the side, adiffusion sheet arranged on the light guide body, a lens sheet (alsocalled a prism sheet) arranged on the diffusion sheet, and a reflectionsheet arranged to extend to a lower side of the light guide body, whichare housed in a mold.

[0008] Incidentally, the technique like this is disclosed in, forexample, Japanese Patent Publication No. 19474/1985, Japanese UtilityModel Unexamined Publication No. 22780/1992, and U.S. Pat. No.5,835,139.

SUMMARY OF THE INVENTION

[0009]FIG. 22 is a schematic view for explaining an example of a fittingmethod for fitting a liquid crystal display module to a notebook-sizepersonal computer.

[0010] In the drawing, reference numeral 100 designates an outer case ofa display portion of a notebook-size personal computer; and 101, aninner case of the display portion of the notebook-size personalcomputer. As shown in the drawing, a liquid crystal display module 102is fixed to the outer ease 100 of the notebook-size personal computer byfitting screws 120 through a side beam 110.

[0011] Thus, inserts to which the fitting screws 120 are screwed, areembedded in the mold of the liquid crystal display module 102.

[0012] Incidentally, although the side beam 110 and the fitting screws120 are provided at both sides of the liquid crystal display module 102,they are omitted in FIG. 22.

[0013] However, in recent years, as a picture frame width of the liquidcrystal display module is reduced and the thickness thereof is reduced,the thickness of the mold itself is further reduced to, for example, 5.0mm or less. “The picture frame” of the liquid crystal display moduledescribed in this present specification designates, for example, aframe-like portion surrounding an opening both of which are provided inan upper surface of the liquid crystal display module 102 shown in FIG.22.

[0014] Thus, in a conventional liquid crystal display module, there hasbeen a problem that it is difficult to certainly fit the insert in themold.

[0015] Besides, there is also known a method in which a compromise platenut is used, and the fitting screw 120 is screwed to this compromiseplate nut, so that the liquid crystal display module is fitted to thenotebook-size personal computer.

[0016] In this case, the fitting screw 120 is prevented from beingdropped off from the frame by inserting the compromise plate nut into anotch of the mold (the inner case) and pressing it with a side of theframe (an outer case) which is fitted in this so as to cover the outerperiphery of the mold.

[0017] However, there has been a problem that it is difficult tosimultaneously fit four or more compromise plate nuts in the notches ofthe mold and to cover them with the frame.

[0018] The present invention has been made to solve the problems of theprior art, and an object of the present invention is to provide atechnique in a liquid crystal display device which enables a screwmember to which a fitting screw for fixing a liquid crystal displaydevice to an exterior ease is screwed, to be easily and certainlyfitted.

[0019] Another object of the present invention is to provide a techniquein a liquid crystal display device which enables a screw mechanism of afitting screw for fixing a liquid crystal display device to an exteriorease to be simplified.

[0020] Still another object of the present invention is to provide atechnique which enables the picture frame width of a liquid crystaldisplay device to be reduced.

[0021] Still another object of the present invention is to provide atechnique which enables the thickness of a liquid crystal display deviceto be reduced.

[0022] The objects, other objects and novel features of the presentinvention will be clarified by the description of the presentspecification and the accompanying drawings.

[0023] Among the inventions disclosed in the present application, thebrief descriptions of the typical ones are as follows:

[0024] That is, the present invention is applied to a liquid crystaldisplay device in which a frame member (casing-like member) is fixed ina housing member (typified by a member known as a mold) for housingcomponents (liquid crystal display panel, light source, optical sheet,etc.) of the liquid crystal display device to constitute a so-calledliquid crystal display module, and this liquid crystal display module isfixed to an exterior case.

[0025] The housing member includes, for example, a main surface and sidesurfaces formed around its periphery, and optical parts as thecomponents of the liquid crystal display device are housed on the mainsurface surrounded by the side surfaces.

[0026] In the case of the liquid crystal display module provided with asidelight type light source, a reflection plate, a light guide body, anoptical sheet such as a light diffusion sheet and a prism sheet arestacked up in this order on the main surface. The light guide body isarranged in the inside of the housing member so that one of its mainsurfaces faces the main surface of the housing member, and a lightsource unit including a fluorescent lamp is provided along at least oneof its side surfaces.

[0027] In the case of the liquid crystal display module provided with adirect backlight type light source, a reflection plate, a light sourceunit made of a plurality of fluorescent lamps fixed to this, a lightdiffusion plate, an optical sheet, and a liquid crystal display panelare stacked up in this order on the main surface.

[0028] Either of the light sources is arranged to face a main surface ofthe liquid crystal display panel opposite to a display surface side(main surface side of a frame member), and irradiates light(illuminating light) radiated from this light source to the main surfaceof the liquid crystal display panel. Incidentally, this stackingdirection of the parts is called a thickness direction of the liquidcrystal display device or the liquid crystal display module in thepresent specification.

[0029] The liquid crystal display panel is also called a liquid crystaldisplay element, and is distinguished from the liquid crystal displaydevice including this and its peripheral part. The exterior case is abox in which the liquid crystal display module (also called the liquidcrystal display device) including the housing member and the framemember is housed, and corresponds to, for example, a housing of anotebook-size personal computer. Thus, for example, the outer surface ofthe liquid crystal display module is covered with the exterior case(also called the outer ease) except for its display surface (a screen onwhich an image is displayed).

[0030] When the present invention is applied to this sort of liquidcrystal display device, a screw tightening member (hereinafter referredto as a “screw member”) to which a fitting screw for fixing the liquidcrystal display module to the exterior case is screwed, is provided atthe side surface (side wall) of the housing member, a protruded portionprotruding in the thickness direction of the liquid crystal displaymodule (in other words, in the height direction of the side wall of thehousing member) is provided in a region where the screw member of thehousing member is provided, and further, an opening in which theprotruded member of the housing member is inserted, is provided in theframe member. In the case of the fitting screw having external thread(i.e. being a bolt), the screw member has internal thread formed thereat(as being i.e. Nut).

[0031] The aforementioned means is able to sufficiently increase thethickness (in the thickness direction of the liquid crystal displaymodule) of the periphery of the screw member of the housing member.

[0032] For example, even if the thickness (in the thickness direction ofthe liquid crystal display module) of the housing member is made 5.0 mmor less by the reduction in thickness of the liquid crystal displaydevice, the present invention is still able to prevent the screw memberfrom rotating in the housing member or being drawn out therefrom.

[0033] Besides, the present invention is characterized in that in aliquid crystal display device, a screw member to which a fitting screwfor fixing the liquid crystal display device to an exterior case isscrewed, is provided at a side wall of a housing member, a protrudedportion protruding in a direction of a tapped hole of the screw memberis provided in a region of the side wall of the housing member where thescrew member is provided, and further, an opening in which the protrudedportion of the housing member is inserted, is provided in a side wall ofa frame member.

[0034] The aforementioned means is able to reduce the picture framewidth of the liquid crystal display module by the thickness of the framemember.

[0035] Besides, the present invention is characterized in that in aliquid crystal display device, a screw member to which a fitting screwfor fixing the liquid crystal display device to an exterior ease isscrewed, is provided at a side wall of a housing member, and a sectionalshape of the screw member is made such that a length in a directionorthogonal to the thickness direction of the liquid crystal displaydevice is longer than a length in the thickness direction of the liquidcrystal display device.

[0036] Since the sectional shape of the screw member is made, forexample, elliptical or rectangular, the aforementioned means enables toprevent the screw member from rotating in the frame member or beingdrawn out therefrom.

[0037] Besides, the present invention is characterized in that in aliquid crystal display device, a screw member to which a fitting screwfor fixing the liquid crystal display device to an exterior case isscrewed, is fixed to a side wall of a housing member by adhesion ormechanical means.

[0038] Since the screw member is previously fixed to the side wall ofthe housing member, the aforementioned means facilitates fitting of thescrew member to the housing member, and enables to prevent the screwmember from being dropped off from the frame member in an assemblingprocess of the liquid crystal display device.

[0039] Besides, the present invention is characterized in that in aliquid crystal display device, a screw member to which a fitting screwfor fixing the liquid crystal display device to an exterior case isscrewed, is inserted in a groove provided in a side wall of a housingmember, and an opening of the groove is covered with a frame member.

[0040] Since the screw member is held by the groove provided in thehousing member, the aforementioned means facilitates fitting of thescrew member to the housing member, and enables to prevent the screwmember from being dropped off from the frame member in an assemblingprocess of the liquid crystal display device.

[0041] Besides, the present invention is characterized in that in aliquid crystal display device, a screw member to which a fitting screwfor fixing the liquid crystal display device to an exterior ease isscrewed, is provided in a concave portion provided in a side wall of ahousing member, and is held by a side wall of a frame member and a pawlprovided on the side wall of the frame member.

[0042] Since the screw member is held by the concave portion provided inthe housing member, the side wall of the frame member, and the pawlprovided on the side wall of the frame member, the aforementioned meansfacilitates fitting of the screw member to the housing member, andenables to prevent the screw member from being dropped off from theframe member in an assembling process of the liquid crystal displaydevice.

[0043] Besides, the present invention is characterized in that in aliquid crystal display device, a fitting screw for fixing the liquidcrystal display device to an exterior case is screwed to a tapped holeprovided in a side wall of a frame member.

[0044] The aforementioned means enables to simplify a screw mechanism ofthe fitting screw.

[0045] Besides, the present invention is characterized in that in aliquid crystal display device, a fitting screw for fixing the liquidcrystal display device to an exterior case, is screwed to a screw memberwith a spring provided on a frame member.

[0046] The aforementioned means facilitates fitting of the screw memberto the frame member, and enables to prevent the screw member from beingdropped off from the frame member in an assembling process of the liquidcrystal display device.

[0047] In the case where the liquid crystal display device of thepresent invention described above is mounted on the housing of acomputer, it becomes unnecessary to provide a tapped hole which receivesa screw (the aforementioned fitting screw) for fixing the liquid crystaldisplay device to the housing, to the housing member itself. Thus, whenthe liquid crystal display device (this is already assembled) is mountedon the computer, a mechanical load (vibration, etc.) by rotation of thefitting screw is not directly applied to the housing member.Accordingly, the deformation of the housing member in an assemblingprocess of the computer, and the possibility of the resultant deviationof the liquid crystal display element, the optical sheet, and the likein the liquid crystal display device from the predetermined arrangementcan be suppressed. Especially, in the case where the housing member ismanufactured as a mold made of a synthetic resin, the effect ofpreventing the damage of the liquid crystal display device according tothe present invention becomes remarkable.

[0048] On the other hand, as the liquid crystal display device becomesthinner, the size of the housing member in the thickness direction ofthe liquid crystal display device also becomes small. Under suchcircumstances, it becomes difficult to provide the tapped hole to whichthe fitting screw is screwed, in the side wall of the housing member. Ifthe diameter of the tapped hole is made larger than a predeterminedratio (depending on the material of the housing member) with respect tothe height of the side wall of the housing member, the mechanicalstrength of the tapped hole itself is lowered. Especially, since thescrew for fitting the liquid crystal display device to the computer isrequired to be stronger than the screw used for assembling the liquidcrystal display device, its diameter must be made large. On the otherhand, in the Liquid crystal display device of the present invention,since the tapped hole is not directly formed in the housing member, butis formed in the screw member prepared differently from this or in theside surface of the frame member (especially made of metal), even if thehousing member becomes thin, the fixing strength between the liquidcrystal display device and the exterior case (housing of the computer,etc.) does not deteriorate. Besides, by providing an opening withoutscrew thread in the side wall of the housing member and by merelyinserting the tip of the fitting screw into this, the position of theliquid crystal display device with respect to the exterior ease can befurther stably held.

[0049] Besides, the present invention is characterized in that in aliquid crystal display device in which a driving circuit board isarranged between a liquid crystal display element and a housing member,a concave portion is provided in a region of the driving circuitsubstrate where a fitting screw for fixing the liquid crystal displaydevice to an exterior case is provided.

[0050] Besides, the present invention is characterized in that in aliquid crystal display device in which a driving circuit board isarranged between a liquid crystal display element and a housing member,a region of the driving circuit board where a fitting screw for fixingthe liquid crystal display device to an exterior case is provided, isconstituted by a flexible wiring board.

[0051] According to the aforementioned means, in the case where thedriving circuit board is arranged between the liquid crystal displayelement and the housing member and the thickness of the liquid crystaldisplay module is reduced, interference between the fitting screw andthe driving circuit board can be prevented.

[0052] These and other objects, features and advantages of the presentinvention will become more apparent from the following description whentaken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0053]FIG. 1 is an exploded perspective view showing a schematicstructure of a TFT system liquid crystal display module (LCM) to whichthe present invention is applied;

[0054]FIG. 2 is a sectional view showing a main portion sectionalstructure of a backlight unit of the liquid crystal display module shownin FIG. 1;

[0055]FIG. 3 is a main portion sectional view showing a state where theliquid crystal display module shown in FIG. 1 is fitted to anotebook-size personal computer by a conventional fitting method 1;

[0056]FIG. 4 is a view for explaining a fitting portion of an insert ofa liquid crystal display module of embodiment 1 of the presentinvention;

[0057]FIGS. 5A to 5C are views for explaining a fitting portion of aninsert of a liquid crystal display module of embodiment 2 of the presentinvention, FIG. 5A is a front view of the liquid crystal display module,FIG. 5B is a main portion sectional view showing a sectional structurealong line A-A′ shown in FIG. 5A, and FIG. 5C is an upper plan viewshowing a shape of a mold to which the insert is fitted;

[0058]FIGS. 6A and 6B are views for explaining a fitting portion of aninsert of a liquid crystal display module of embodiment 3 of the presentinvention, FIG. 6A is a front view of the liquid crystal display module,and FIG. 6B is a main portion sectional view showing a sectionalstructure along line A-A′ shown in FIG. 6A;

[0059]FIG. 7 is a view for explaining a method of fitting the liquidcrystal display module shown in FIG. 1 to a notebook-size personalcomputer by a conventional fitting method 2;

[0060]FIG. 8 is a view for explaining a fitting method of a plate nut ofa liquid crystal display module of embodiment 4 of the presentinvention;

[0061]FIG. 9 is a view for explaining a fitting method of a plate nut ofa liquid crystal display module of embodiment S of the presentinvention;

[0062]FIG. 10 is a view for explaining a fitting method of a compromiseridged nut of a liquid crystal display module of embodiment 6 of thepresent invention;

[0063]FIG. 11 is a view for explaining a fitting method of a compromiseridged nut of a liquid crystal display module of embodiment 7 of thepresent invention;

[0064]FIG. 12 is a view for explaining another fitting method of thecompromise ridged nut of the liquid crystal display module of theembodiment 7 of the present invention;

[0065]FIG. 13 is a view for explaining a fitting method of a compromiseridged nut of a liquid crystal display module of embodiment 8 of thepresent invention;

[0066]FIG. 14 is a view for explaining a fitting method of a compromiseridged nut of a liquid crystal display module of embodiment 9 of thepresent invention;

[0067]FIG. 15 is a view for explaining a fitting method of a compromiseridged nut of a liquid crystal display module of embodiment 10 of thepresent invention;

[0068]FIGS. 16A to 16C are views for explaining a fitting method of aC-shaped nut of a liquid crystal display module of embodiment 11 of thepresent invention, FIG. 16A is a front view of the liquid crystaldisplay module, FIG. 16B is a main portion sectional view showing asectional structure along line A-A′ shown in FIG. 16A, and FIG. 16C is aperspective view showing a shape of a metal plate 40 formed in theC-shaped nut;

[0069]FIGS. 17A and 17B are views for explaining a frame of a liquidcrystal display module of embodiment 12 of the present invention, FIG.17A is a front view of the liquid crystal display module (frame), andFIG. 17B is a main portion sectional view showing a sectional structurealong line A-A′ shown in FIG. 17A;

[0070]FIGS. 18A and 18B are views for explaining a fitting method of aleaf spring nut of a liquid crystal display module of embodiment 13 ofthe present invention;

[0071]FIG. 19 is a sectional view showing a main portion sectionalstructure of a liquid crystal display module which is reduced inthickness;

[0072]FIG. 20 is a plan view conceptually showing a plane shape of adriving circuit board of a liquid crystal display module of embodiment14 of the present invention in a thickness direction of the liquidcrystal display module;

[0073]FIGS. 21A and 21B are views for explaining a shape of a drivingcircuit board of a liquid crystal display module of embodiment 15 of thepresent invention, FIG. 21A is a plan view showing the arrangement of afitting screw, a frame, and a driving circuit board, and FIG. 21B is amain portion sectional view showing the arrangement of the fittingscrew, the frame, and the driving circuit board; and

[0074]FIG. 22 is a schematic view for explaining an example of a fittingmethod of fitting a liquid crystal display module to a notebook-sizepersonal computer.

DETAILED DESCRIPTION

[0075] Hereinafter, embodiments of the present invention will bedescribed in detail with reference to the drawings.

[0076] Incidentally, in all drawings for the description of theembodiments, portions having the same function are designated by thesame reference characters and the duplicate explanation is omitted.

[0077] [Embodiment 1]

[0078] <Basic Structure of a TFT System Liquid Crystal Display Module toWhich the Present Invention is Applied>

[0079]FIG. 1 is an exploded perspective view showing a schematicstructure of a TFT system liquid crystal display module (LCM) to whichthe present invention is applied.

[0080] The liquid crystal display module (LCM) shown in FIG. 1 isconstituted by a easing-shaped frame 4 made of a metal plate, a liquidcrystal display panel (LCD: liquid crystal display element according tothe present invention) 5, and a backlight unit.

[0081] The liquid crystal display panel S is constructed such that a TFTboard on which a pixel electrode, a thin film transistor and the likeare formed, and a filter board on which a counter electrode, a colorfilter, and the like are formed, are superposed on each other with apredetermined interval, both the boards are bonded to each other by aseal member provided into a frame shape in the vicinity of the peripherybetween both the boards, a liquid crystal is injected into the inside ofthe seal member between both the boards from a liquid crystal injectionport provided in a part of the seal member, sealing is made, andfurther, polarizing plates are bonded to the outside of both the boards.

[0082] Here, a plurality of drain drivers and gate drivers made of asemiconductor integrated circuit device (IC) are mounted on a glassboard of the TFT board.

[0083] Driving power, display data, and control signals are supplied tothe drain drivers through a flexible printed wiring board 1, and drivingpower and control signals are supplied to the gate drivers through aflexible printed wiring board 2.

[0084] These flexible printed wiring boards 1, 2 are connected to adriving circuit board 3 provided at a rear side of the backlight unit.

[0085] The backlight unit of the liquid crystal display module of thisembodiment is constructed such that a cold-cathode fluorescent lamp 16,a wedge-shaped light guide body (a side shape of which is trapezoid) 9,diffusion sheets 6, 8, lens sheets 7, and a reflection sheet 10 arefitted in the order shown in FIG. 1 in a mold 14 having a side wall andformed into a frame shape.

[0086] Incidentally, in FIG. 1, reference numeral 11 designates a rubberbush; 12, a connector; and 18, 19, cables.

[0087] <Structure of the Backlight Unit of the Liquid Crystal DisplayModule Shown in FIG. 1>

[0088]FIG. 2 is a sectional view showing a main portion sectionalstructure of the backlight unit of the liquid crystal display moduleshown in FIG. 1.

[0089] Incidentally, FIG. 2 shows the sectional structure obtained bycutting along a plane orthogonal to the cold-cathode fluorescent lamp16.

[0090] As shown in FIG. 2, the cold-cathode fluorescent lamp 16 isarranged in the vicinity of a side of the light guide body 9, along theside of the light guide body 9, and in parallel with the side of thelight guide body 9.

[0091] The light guide body 9 guides light radiated from thecold-cathode fluorescent lamp 16 to a portion remote from thecold-cathode fluorescent lamp 16, and uniformly irradiates the wholeliquid crystal display panel with the light.

[0092] Here, the light guide body 9 is formed into such a wedge shapethat its surface facing the cold-cathode fluorescent lamp 16 is formedto be wide and its section becomes small as it goes away from thecold-cathode fluorescent lamp 16.

[0093] The diffusion sheets 6, 8 and the two lens sheets 7 are arrangedon the light guide body.

[0094] The reflection sheet 10 which has a portion of an almost C-shapedsectional shape at the cold-cathode fluorescent lamp and a white orsilver inner surface, covers the cold-cathode fluorescent lamp 16 overalmost the whole length, and is arranged to extend to the lower side ofthe light guide body 9.

[0095] By this, light radiated in a direction different from the lightguide body 9 can be concentrated on the light guide body 9 withoutwaste.

[0096] <Fitting Method I of the Liquid Crystal Display Module Shown inFIG. 1 to a Notebook-Size Personal Computer>

[0097]FIG. 3 is a main portion sectional view showing a state where theliquid crystal display module shown in FIG. 1 is fitted to anotebook-size personal computer by a conventional fitting method 1.Incidentally, FIG. 3 shows a sectional structure obtained by cutting inthe same direction as an extension direction of the cold-cathodefluorescent lamp 16.

[0098] As shown in FIG. 3, the liquid crystal display module shown inFIG. 1 includes inserts 13 having internal threads formed therein atfour places (only two places are shown in FIG. 3) of sides in the mold14.

[0099] Then, by screwing up fitting screws 120 having external threadsformed thereon to the respective inserts 13 through holes formed in anexterior case (for example, a plastic case) 100 of a display portion ofthe notebook-size personal computer, a metal side beam 110, and theframe 4, the liquid crystal display module is fitted to thenotebook-size personal computer.

[0100] Besides, as shown in FIG. 3, the liquid crystal display moduleshown in FIG. 1 is constructed such that the liquid crystal displaypanel 5 on which the plurality of drain drivers and gate drivers aremounted, is housed between the frame 4 having a display window and thebacklight unit.

[0101] The region of the display window of the frame 4 constitutes adisplay region of the liquid crystal display module (LCM), and a regionother than this display region, that is, a region of the periphery ofthe display window of the frame 4 is called a normal picture frame.

[0102] Incidentally, in FIG. 3, SUB 1 designates a TFT board; SUB 2, acolor filter board; IC2, a gate driver; and POL1, POL2, polarizingplates.

[0103] As shown in FIG. 3, in the case where the liquid crystal displaymodule is fitted to the notebook-size personal computer by using theinsert 13, force in the rotation direction is applied to the insert 13,and further, if force in the horizontal direction is applied to thenotebook-size personal computer, force in the direction of drawing outthe insert 13 is applied.

[0104] In order to prevent these, it is necessary to improve adhesion toresin which makes the mold 14 and to increase friction by applyingknurling to an exterior of the insert 13, and therefore, it becomesnecessary to increase the thickness of the mold 14 to a certain degreeat the periphery of the insert 13.

[0105] However, when the thickness (corresponding to the height of theside wall of the mold 14 in FIG. 3) of the mold itself becomes furtherthin, for example, S mm or less, by the reduction in thickness of theliquid crystal display module, it becomes impossible to secure thesufficient thickness of the mold 14 around the insert 13. For example,in the case where the position of the fitting hole of the insert 13 ismade the center of the mold 14 in the thickness direction, since theframe 4 exits, there is a possibility that the thickness of the mold 14at the upper side of the insert 13 can not be made sufficient.

[0106] The liquid crystal display device of the embodiment 1 of thepresent invention resolves such situations as mentioned previously byfeatures thereof which will be described as follows.

[0107] <Feature of a TFT System Liquid Crystal Display Module ofEmbodiment 1 of the Present Invention>

[0108]FIG. 4 is a view for explaining a fitting portion of an insert 13of a liquid crystal display module of the present embodiment.

[0109] Incidentally, the present embodiment will be described withreference to FIGS. 1 to 3 and on the basis of the aforementioned liquidcrystal display module.

[0110]FIG. 4 is a close-up perspective view showing respective portionsof the frame 4 and the mold 14 relating to a mounting structure forfitting the liquid crystal display module as shown in FIG. 3 to theexterior case by the fitting screw 120, together with the insert 13fitted in the mold 14, and illustration of portions other than those andmembers (exterior case 100, fitting screw 120, etc.) is omitted.

[0111] As shown in FIG. 4, the present embodiment is characterized inthat an opening (slot) 4 a is provided at an upper portion of a regionwhere a fitting hole of the insert 13 is provided, and a protrudedportion 14 a protruding to the opening 4 a of the frame 4 is provided onthe mold 14.

[0112] On this account, even if the thickness of the mold itself ismade, for example, 5.0 mm or less, by the reduction in the thickness ofthe liquid crystal display module, the thickness of the mold 14 aroundthe insert 13 can be sufficiently increased, and the present embodimentis still able to prevent the inserts 13 from rotating in the mold 14 orbeing drawn off therefrom.

[0113] Incidentally, in the present embodiment, it is necessary that theopening 4 a of the frame 4 has a sufficient size so that the protrudedportion 14 a of the mold 14 goes therein.

[0114] Besides, it is desirable that the height of the protruded portion14 a is almost equal to the thickness of the frame 4, and the width ofthe protruded portion 14 a is at least the outer diameter of the insert13+about 1 mm. Further, the protruded portion 14 a may be used as aprotruded portion for locating of the mold with respect to the frame.

[0115] [Embodiment 2]

[0116] <Feature of a TFT System Liquid Crystal Display Module ofEmbodiment 2 of the Present Invention>

[0117]FIGS. 5A to 5C are views for explaining a fitting portion of aninsert 13 of a liquid crystal display module of embodiment 2 of thepresent embodiment, FIG. 5A is a front view, FIG. 5B is a main portionsectional view showing a sectional structure along line A-A′ shown inFIG. 5A, and FIG. 5C is an upper plan view showing a shape of a mold 14.

[0118] Incidentally, since the structure of the liquid crystal displaymodule of the present embodiment is also the same as the liquid crystaldisplay module shown hi FIG. 1, in FIGS. 5A to 5C, only portionsrelating to a fitting screw 120 are shown similarly to FIG. 4, and theother structure is omitted.

[0119] As shown in FIGS. 5A and 5B, in the present embodiment, anopening 4 b is provided at a side wall of a frame 4 made to face a sidewall of a mold 14 in which the insert 13 is provided.

[0120] In the present embodiment, although the opening 4 b is formed asa notch (inverted U-shape without a lower side thereof) which is made tocorrespond to the thin liquid crystal display module, it may be replacedby a rectangular or circular hole in accordance with the shape of theliquid crystal display module.

[0121] A protruded portion 14 b is provided at the side wall of the mold14 in which the insert 13 is provided, and this protruded portion 14 bis fitted in the opening 4 b of the frame 4.

[0122] Then, in the present embodiment, the fitting screw 120 is screwedup to the insert 13 through holes formed in an exterior case 100 of adisplay portion of a notebook-size personal computer and a metal sidebeam 110, and the liquid crystal display module is fitted to thenotebook-size personal computer.

[0123] Accordingly, in the present embodiment, the picture frame widthof the liquid crystal display module can be reduced by the thickness ofthe frame 4.

[0124] [Embodiment 3]

[0125] <Feature of a TFT System Liquid Crystal Display Module ofEmbodiment 3 of the Present Invention>

[0126]FIGS. 6A and 6B are views for explaining a fitting portion of aninsert 13 of a liquid crystal display module of the present embodiment,FIG. 6A is a front view, and FIG. 6B is a main portion sectional viewshowing a sectional structure along line A-A′ shown in FIG. 6A.

[0127] Incidentally, since the structure of the liquid crystal displaymodule of the present embodiment is also the same as the liquid crystaldisplay module shown in FIG. 1, in FIGS. 6A and 6B, only portionsrelating to a fitting screw 120 are shown similarly to FIG. 4, and theother structure is omitted.

[0128] As shown in FIG. 6A, the present embodiment is characterized inthat the sectional shape of the insert 13 is made elliptical.

[0129] On this account, even if the thickness of a mold itself is made,for example, 5.0 mm or less, by the reduction in thickness of the liquidcrystal display module, the present embodiment is still able to preventthe inserts 13 from rotating in the mold 14 or being drawn outtherefrom.

[0130] Incidentally, in the present embodiment, even if the sectionalshape of the insert 13 is made rectangular instead of making thesectional shape of the insert elliptical, the same effect can beobtained.

[0131] [Embodiment 4]

[0132] <Fitting Method 2 of the Liquid Crystal Display Module Shown inFIG. 1 to a Notebook-Size Personal Computer>

[0133]FIG. 7 is a view for explaining a method of fitting the liquidcrystal display module shown in FIG. 1 to a notebook-size personalcomputer by a conventional fitting method 2.

[0134] Incidentally, since the structure of the liquid crystal displaymodule of the present embodiment is also the same as the liquid crystaldisplay module shown in FIG. 1, in FIG. 7, only portions relating to thefitting screw 120 are shown similarly to FIG. 4, and the other structureis omitted.

[0135] The present embodiment shown in FIG. 7 is characterized in suchstructure that instead of providing the insert 13 in the mold 14, acompromise plate nut 40 is interposed between the frame 4 and the mold14, and a fitting screw (120 of FIG. 3) is screwed to this compromiseplate nut 40 to mount the liquid crystal display module to an exteriorcase (100 of FIG. 3).

[0136] By this structural feature, the present embodiment is differentfrom those shown in FIGS. 4 to 6.

[0137] In the method shown in FIG. 7, the compromise plate nut 40 shownin the drawing is fitted in a notch 141 of the mold 14, and thiscompromise plate nut 40 is covered with the frame 4 to prevent it frombeing dropped off. The notch 141 can also be provided by forming aconcave portion or a groove in the outside side wall of the mold 14.

[0138] By this, the rotation of the compromise plate nut 40 in the upand down and right and left directions is restricted by engagement withthe notch 141 of the mold 14, and the movement in the pushing directioninto the inside of the liquid crystal display module is restricted bythe wall of the mold 14.

[0139] The frame 4 is fixed to the mold 14 in such a manner that itsinside side wall is made to face the outside side wall of the mold 14,and after the frame is fitted to the exterior of the mold 14 while thepositions of the opening 4 b and the notch 141 are made coincident witheach other, two screws 121 are screwed up to tapped holes 14 d of themold 14 through openings 4 d of the frame 4.

[0140] By this, the movement of the compromise plate nut 40 dropping offfrom the notch 141 can be prevented by the frame 4.

[0141] A fitting screw (120 of FIG. 3) is screwed up to a tapped hole120 a of the compromise plate nut 40 through the hole (opening) 4 bformed in an exterior case (100 of FIG. 3) of the display portion of thenotebook-size personal computer, a metal side beam (110 of FIG. 3), andthe frame 4, so that the liquid crystal display module is fitted to thenotebook-size personal computer.

[0142] Incidentally, when the fitting screw (120 of FIG. 3) is screwedin the tapped hole 120 a, its portion protruding from the tapped hole120 a is housed in an opening 14 c provided in the notch 141 of the mold14.

[0143] As set forth above, in order to fix the liquid crystal displaymodule to the exterior case (100 of FIG. 3) of the display portion ofthe notebook-size personal computer, four or more places are normallyscrewed up.

[0144] Since the compromise plate nut 40 is apt to be dropped off fromthe mold 14 if the frame 4 does not exist, it is difficult to fit thefour or more compromise plate nuts 40 to the notches 141 of the mold 14and to cover them with the frame 4 at the same time.

[0145] Thus, conventionally, after the mold 14 is covered with the frame4, the compromise plate nut 40 is inserted from the back of the module.

[0146] However, in the conventional liquid crystal display module, whenthe compromise plate nut 40 is inserted from the back of the moduleafter the mold 14 is covered with the frame 4, in order to facilitatethe insertion of the compromise plate nut 40 into a gap between the mold14 and the frame 4, it is necessary that the mold 14 is slanted or theheight of the notch 141 provided in the mold 14 is lowered.

[0147] Like this, in the case where the liquid crystal display moduleshown in FIG. 1 is fitted to the notebook-size personal computer by theconventional fitting method 2, there has been a problem that it isdifficult to balance an insertion property of the compromise plate nut40 with falling out.

[0148] The liquid crystal display device of the embodiment 4 of thepresent invention resolves such situations as mentioned previously byfeatures thereof which will be described as follows.

[0149] <Feature of a TFT System Liquid Crystal Display Module ofEmbodiment 4 of the Present Invention>

[0150]FIG. 8 is a view for explaining a fitting method of a plate nut ofa liquid crystal display module of the present embodiment.

[0151] Incidentally, since the structure of the liquid crystal displaymodule of the present embodiment is also the same as the liquid crystaldisplay module shown in FIG. 1, in FIG. 8, only portions relating tofixing (see FIG. 3) of a liquid crystal display device and an exteriorcase of a personal computer or the like by a fitting screw 120 are shownsimilarly to FIG. 7, and illustration of the other structure is omitted.

[0152] In the present embodiment, before a mold 14 is covered with aframe 4, a plate nut 30 is fixed to a predetermined position of the mold14 by an adhesive 41.

[0153] In an example of FIG. 8, the side wall of the mold 14 ispartially made thin to form a concave portion (corresponding to theaforementioned notch) 141. The adhesive 41 is coated on the bottom ofthe concave portion 141.

[0154] The plate nut 30 has a tapped hole 120 a to which a fitting screw(120 of FIG. 3) is screwed, similarly to the compromise plate nut 40.

[0155] Incidentally, in the present embodiment, the plate nut 30 may bethe compromise plate nut 40 shown in FIG. 7, or may be a generalrectangular plate nut.

[0156] Further, a roughness for positioning may be provided to the platenut 30 and the mold 14, or a pressure sensitive adhesive double coatedtape may be used instead of the adhesive 41.

[0157] Like this, since the plate nut 30 is previously fixed to the mold14 by the adhesive 41 (or, pressure sensitive adhesive double coatedtape, double sided adhesive tape), the present embodiment facilitatesfitting of the plate nut 30 to the mold 14, and is able to prevent theplate nut 30 from falling out in an assembling process of the liquidcrystal display module, and to improve work efficiency.

[0158] [Embodiment 5]

[0159] <Feature of a TFT System Liquid Crystal Display Module ofEmbodiment 5 of the Present Invention>

[0160]FIG. 9 is a view for explaining a fitting method of a plate nut ofa liquid crystal display module of the present embodiment.

[0161] Incidentally, since the structure of the liquid crystal displaymodule of the present embodiment is also the same as the liquid crystaldisplay module shown in FIG. 1, in FIG. 9, only portions relating tofixing (see FIG. 3) of a liquid crystal display device and an exteriorcase of a personal computer or the like by a fitting screw 120 are shownsimilarly to FIG. 7, and illustration of the other structure is omitted.

[0162] In the present embodiment, before a mold 14 is covered with aframe 4, a compromise plate nut 31 is fixed to a predetermined positionof the mold 14 by a screw 122.

[0163] Incidentally, in the present embodiment, a roughness forpositioning may be provided to the compromise plate nut 31 and the mold14.

[0164] In a cut hole 31 a provided in the compromise plate nut 31 forfixing to the mold 14, it is desirable that a concave portion in which ahead of the screw 122 is inserted, is provided at the periphery of atapped hole at a frame side, so that the head of the screw 122 does notprotrude from the compromise plate nut 31.

[0165] The screw 122 can be made a flush bolt, and also in this case, itis possible to prevent the screw 122 from protruding from the compromiseplate nut 31.

[0166] It is also possible to tighten the frame 4, the mold 14, and thecompromise plate nut 31 together by the screw 122, and in that case, inthe frame 4, at a screwing portion, it is necessary to provide a concaveportion in which the head of the screw 122 is inserted. Further, it isdesirable to shave the plate thickness of the compromise plate nut 31 inaccordance with the concave portion of the frame 4.

[0167] Like this, since the compromise plate nut 31 is previously fixedto the mold 14 by the screw 122, the present embodiment facilitatesfitting of the compromise plate nut 31 to the mold, and is able toprevent the compromise plate nut 31 from being dropped off in anassembling process of the liquid crystal display module and to improvework efficiency.

[0168] [Embodiment 6]

[0169] <Feature of a TFT System Liquid Crystal Display Module ofEmbodiment 6 of the Present Invention>

[0170]FIG. 10 is a view for explaining a fitting method of a compromiseridged nut of a liquid crystal display module of the present embodiment.

[0171] Incidentally, since the structure of the liquid crystal displaymodule of the present embodiment is also the same as the liquid crystaldisplay module shown in FIG. 1, in FIG. 10, only portions relating tofixing (see FIG. 3) of a liquid crystal display device and an exteriorcase of a personal computer or the like by a fitting screw 120 are shownsimilarly to FIG. 7, and illustration of the other structure is omitted.

[0172] In the present embodiment, a compromise ridged nut 32 has a cuthole 32 a in which a screw 122 for fixing a frame 4 to a mold 14 isinserted, and a tapped hole 120 a in which the fitting screw 120 (forexample, see FIG. 3) for fitting the liquid crystal display device tothe housing of the notebook-size personal computer is inserted, and hasa step provided between a portion where the tapped hole 120 a isprovided and its periphery, and the nut is fixed to the mold 14 by thescrew 122.

[0173] As shown in FIG. 10, when viewed from the outside of the liquidcrystal display device, the surface where the tapped hole 120 a of thecompromise plate nut 32 is provided, rises from the surface where thecut hole 32 a is provided. In other words, the surface of the compromiseridged nut 32 at the side of the side wall of the frame 4 includes theportion (for example, called a central portion) where the tapped hole120 a is provided and portions (for example, called peripheral portions)respectively extending from both the sides facing each other, and thesurface of the central portion protrudes toward the side of the sidewall of the frame 4 from the surfaces of the peripheral portions.Accordingly, the illustrated shape of the compromise ridged nut 32 ischaracterized by having a step in the thickness direction of one of theside wall of the mold 14 to which this nut is provided and the side wallof the frame 4.

[0174] As is apparent from FIG. 10, in the present embodiment, thetapped hole 120 a in which the fitting screw 120 for fitting to thenotebook-size personal computer is inserted, is not covered with theframe 4.

[0175] Similarly to the examples of FIGS. 8 and 9, also in the presentembodiment, a concave portion 141 is formed in the side wall of the mold14 in its thickness direction, and further, in the present embodiment,the side wall of the frame 4 is made depressed toward the side of themold side wall in connection with the concave portion 141.

[0176] An opening 4 d used for fitting the compromise ridged nut 32 tothe mold 14 by the screw 122 is formed in the concave portion of theside wall of the frame, and the concave portion of the side wall of theframe 4 functions as a washer between the head of the screw 122 and thecompromise ridged nut 32 at the periphery of the opening 4 d.

[0177] An opening 4 b corresponding to the step of the compromise ridgednut 32 is also formed in the concave portion of the side wall of theframe 4.

[0178] The opening 4 b shown in the present embodiment is formed,similarly to that explained with reference to FIGS. 5A, 5B, 6A and 6B,as a so-called notch in which a part of the side wall of the framesurrounding the opening 4 b is removed.

[0179] This opening 4 b suppresses the movement of the portion of thecompromise ridged nut 32 protruding toward the side opposite to the mold14 at its right and left end portions.

[0180] Thus, even if an error between the length of the compromiseridged nut 32 and the length of the concave portion 141 of the mold 14in which this is inserted becomes large, the deviation of the compromiseridged nut 32 in the length direction (horizontal direction when viewedfrom the liquid crystal display module) resulting from this can besuppressed by the opening 4 b.

[0181] Accordingly, in the present embodiment, in the ease where theliquid crystal display module is fitted to the notebook-size personalcomputer, the fitting screw 120 is screwed up to the compromise ridgednut 32 through the hole formed in the exterior case (100 of FIG. 3) ofthe display portion of the notebook-size personal computer and the metalside beam (110 of FIG. 3), so that the liquid crystal display module isfitted to the notebook-size personal computer.

[0182] Incidentally, in the present embodiment, a roughness forpositioning may be provided to the compromise ridged nut 32 and the mold14.

[0183] Besides, in the cut hole 32 a provided in the compromise ridgednut 32 for fixing to the mold 14, it is desirable that a concave portionin which a head of the screw 122 is inserted, is provided at theperiphery of a tapped hole at a frame side, so that the head of thescrew 122 does not protrude from the compromise ridged nut 32.

[0184] Besides, the screw 122 can be made a flush bolt, and also in thiscase, it is possible to prevent the screw 122 from protruding from thecompromise ridged nut 32.

[0185] Like this, since the compromise ridged nut 32 is fixed to themold 14 by the screw 122, the present embodiment facilitates fitting ofthe compromise ridged nut 32 to the mold 14, and is able to prevent thecompromise ridged nut 32 from being dropped off in an assembling processof the liquid crystal display module and to improve work efficiency.

[0186] [Embodiment 7]

[0187] <Feature of a TFT System Liquid Crystal Display Module ofEmbodiment 7 of the Present Invention>

[0188]FIG. 11 is a view for explaining a fitting method of a compromiseridged nut of a liquid crystal display module of the present embodiment.

[0189] Incidentally, since the structure of the liquid crystal displaymodule of the present embodiment is also the same as the liquid crystaldisplay module shown in FIG. 1, in FIG. 11, only portions relating tofixing (see FIG. 3) of a liquid crystal display device and an exteriorcase of a personal computer or the like by a fitting screw 120 are shownsimilarly to FIG. 7, and illustration of the other structure is omitted.

[0190] In the present embodiment, a compromise ridged nut 33 providedwith a T-shaped protruded portion 33 a is used, and a slit (groove) 142in which the T-shaped protruded portion 33 a of the compromise ridgednut 33 is inserted, is provided in a mold 14, and the compromise ridgednut 33 is inserted in the slit 142 formed in the mold 14 from above.

[0191] According to the present embodiment, the slit 142 formed in themold 14 restrains the movement of the compromise ridged nut 33 in thecross direction (thickness direction of the mold side wall) and in thehorizontal direction (extending direction of the slit 142), and itsrotation.

[0192] Besides, by covering the opening of the slit 142 provided on theupper surface of the mold 14 with the frame 4, the movement of thecompromise ridged nut 32 in the vertical direction (thickness directionof the liquid crystal display module) is restrained.

[0193] A recess 142 a for providing a space which receives an endportion of the fitting screw (120 of FIG. 3) projecting through a tappedhole 120 a to the mold side, is formed at the central portion of theslit 142.

[0194] As is apparent from FIG. 11, in the present embodiment, thetapped hole 120 a to which the fitting screw 120 for fitting to thenotebook-size personal computer is screwed, is not covered with theframe 4.

[0195] Accordingly, in the present embodiment, in the case where theliquid crystal display module is fitted to the notebook-size personalcomputer, the fitting screw 120 is screwed up to the compromise ridgednut 33 through the hole formed in the exterior case (100 of FIG. 3) ofthe display portion of the notebook-size personal computer and the metalside beam (110 of FIG. 3), so that the liquid crystal display module isfitted to the notebook-size personal computer.

[0196] Incidentally, in the present embodiment, the exterior of the wallportion of the slit 142 in which the T-shaped protruded portion 33 a isinserted may be covered with the frame 4 or may not be coveredtherewith.

[0197] As shown in FIG. 12, when it is not covered with the frame 4,although the picture frame width of the liquid crystal display modulecan be reduced by the thickness of the frame 4, the strength weakens tothe contrary since a portion without a vertical wall of the frame 4becomes large.

[0198] Like this, since the compromise ridged nut 33 is held by the slit142 provided in the mold 14, the present embodiment facilitates fittingof the compromise ridged nut 33 to the mold 14, and is able to preventthe compromise ridged nut from being dropped off in an assemblingprocess of the liquid crystal display module and to improve workefficiency.

[0199] [Embodiment 8]

[0200] <Feature of a TET System Liquid Crystal Display Module ofEmbodiment 8 of the Present Invention>

[0201]FIG. 13 is a view for explaining a fitting method of a compromiseridged nut of a liquid crystal display module of the embodiment 8 of thepresent invention.

[0202] Incidentally, since the structure of the liquid crystal displaymodule of the present embodiment is also the same as the liquid crystaldisplay module shown in FIG. 1, in FIG. 13, only portions relating tofixing (see FIG. 3) of a liquid crystal display device and an exteriorcase of a personal computer or the like by a fitting screw 120 are shownsimilarly to FIG. 7, and illustration of the other structure is omitted.

[0203] Also in the present embodiment, a compromise ridged nut 34provided with a T-shaped protruded portion 34 a is used, a slit (groove)143 in which the T-shaped protruded portion 34 a of the compromiseridged nut 34 is inserted, is provided in a mold 14, and the compromiseridged nut 34 is inserted in the slit 143 formed in the mold 14 fromabove.

[0204] However, the present embodiment is different from the liquidcrystal display module of the embodiment 7 in that the lower surface ofthe protruded portion 34 a of the compromise ridged nut 34 is chamferedand eaves 143 a for preventing the compromise ridged nut 34 from beingdrawn out upwards from the mold 14 are provided at the slit 143 providedin the mold 14.

[0205] Incidentally, a side of the cave 143 a is chamfered so that thecompromise ridged nut 34 can easily enter.

[0206] The present embodiment also facilitates fitting of the compromiseridged nut 34 to the mold 14, and is able to prevent the compromiseridged nut 34 from being dropped off in an assembling process of theliquid crystal display module and to improve work efficiency.

[0207] [Embodiment 9]

[0208] <Feature of a TFT System Liquid Crystal Display Module ofEmbodiment 9 of the Present Invention>

[0209]FIG. 14 is a view for explaining a fitting method of a compromiseridged nut of a liquid crystal display module of the present embodiment.

[0210] Incidentally, since the structure of the liquid crystal displaymodule of the present embodiment is also the same as the liquid crystaldisplay module shown in FIG. 1, in FIG. 14, only portions relating tofixing (see FIG. 3) of a liquid crystal display device and an exteriorease of a personal computer or the like by a fitting screw 120 are shownsimilarly to FIG. 7, and illustration of the other structure is omitted.

[0211] The present embodiment is different from the liquid crystaldisplay module of the embodiment 8 in that a compromise ridged nut 35 isrotated to be inserted in a slit (groove) 144 formed in a mold 14.

[0212] In the present embodiment, chamfering of a protruded portion 35 aof the compromise ridged nut 35 is provided to a surface in a rotationadvancing direction of the fitting screw 120 for fitting the liquidcrystal display module to the notebook-size personal computer.

[0213] The present embodiment also facilitates fitting of the compromiseridged nut 35 to the mold 14, and is able to prevent the compromiseridged nut 35 from being dropped off in an assembling process of theliquid crystal display module and to improve work efficiency.

[0214] [Embodiment 10]

[0215] <Feature of a TFT System Liquid Crystal Display Module ofEmbodiment 10 of the Present Invention>

[0216]FIG. 15 is a view for explaining a fitting method of a compromiseridged nut of a liquid crystal display module of the embodiment 10 ofthe present invention.

[0217] Incidentally, since the structure of the liquid crystal displaymodule of the present embodiment is also the same as the liquid crystaldisplay module shown in FIG. 1, in FIG. 15, only portions relating tofixing (see FIG. 3) of a liquid crystal display device and an exteriorcase of a personal computer or the like by a fitting screw 120 are shownsimilarly to FIG. 7, and illustration of the other structure is omitted.

[0218] In the present embodiment, a compromise ridged nut 36 providedwith a T-shaped protruded portion 36 a is used, and after a mold 14 iscovered with a frame 4, the compromise ridged nut 36 is inserted in aconcave portion 145 formed in the mold 14, and is fixed by bending apawl 25 of the frame 4.

[0219] The present embodiment is also able to prevent the compromiseridged nut 36 from being dropped off in an assembling process of theliquid crystal display module and to improve work efficiency.

[0220] Further, in the present embodiment, contrary to theaforementioned respective embodiments, since it is not necessary thatthe compromise ridged nut 36 is fixed to the mold 14 by the screw 122 oris inserted in the slits 142, 143, 144 of the mold 14, fitting of thecompromise ridged nut 36 to the mold 14 becomes easy as compared withthe aforementioned respective embodiments, and work efficiency can beimproved.

[0221] [Embodiment 11]

[0222] <Feature of a TFT System Liquid Crystal Display Module ofEmbodiment 11 of the Present Invention>

[0223]FIGS. 16A to 16C are views for explaining a fitting method of aC-shaped nut 40 to a liquid crystal display module of the presentembodiment, FIG. 16A is a front view of the liquid crystal displaymodule, FIG. 16B is a main portion sectional view showing a sectionalstructure along line A-A′ shown in FIG. 16A, and FIG. 16C is aperspective view showing a shape of the metal plate 40.

[0224] Incidentally, since the structure of the liquid crystal displaymodule of the present embodiment is also the same as the liquid crystaldisplay module shown in FIG. 1, in FIGS. 16A to 16C, only portionsrelating to a fitting screw 120 are shown similarly to FIG. 4, and theother structure is omitted.

[0225] In the present embodiment, the C-shaped (channel type) nut 40 isused, aside wall 40 a of the C-shaped nut 40 in which a tapped hole 120a is provided, is arranged at a portion of a side wall of a mold 14where a hole 146 in which the fitting screw 120 is inserted is formed,the other side wall 40 b is inserted in a slit (groove) 147 formed inthe mold 14, and the C-shaped nut 40 is fixed by the elasticity of theC-shaped nut itself.

[0226] The present embodiment is also able to prevent the C shaped nut40 from being dropped off in an assembling process of the liquid crystaldisplay module and to improve work efficiency.

[0227] [Embodiment 12]

[0228] <Feature of a TFT System Liquid Crystal Display Module ofEmbodiment 12 of the Present Invention>

[0229]FIGS. 17A and 17B are views for explaining a frame 4 of a liquidcrystal display module of the present embodiment, FIG. 17A is a frontview of the liquid crystal display module (frame 4), and FIG. 17B is amain portion sectional view showing a sectional structure along lineA-A′ shown in FIG. 17A.

[0230] Incidentally, since the structure of the liquid crystal displaymodule of the present embodiment is also the same as the liquid crystaldisplay module shown in FIG. 1, in FIGS. 17A and 17B, only portionsrelating to a fitting screw 120 are shown, and the other structure isomitted.

[0231] In the present embodiment, a tapped hole 120 a is provided in theframe itself, and a hole 146 in which the fitting screw 120 is insertedis formed in a side wall of a mold 14, so that the fitting screw 120 isscrewed to this tapped hole 120 a.

[0232] Accordingly, in the present embodiment, since the plate nut orthe compromise ridged nut is not necessary contrary to theaforementioned respective embodiments, the number of parts can belessened, and a screw mechanism of the fitting screw 120 can besimplified.

[0233] [Embodiment 13]

[0234] <Feature of a TFT System Liquid Crystal Display Module ofEmbodiment 13 of the Present Invention>

[0235]FIGS. 18A and 18B are views for explaining a fitting method of aleaf spring nut 50 of a liquid crystal display module of the embodiment13 of the present invention, FIG. 18A is a front view of the liquidcrystal display module, and FIG. 18B is a main portion sectional viewshowing a sectional structure along line A-A′ shown in FIG. 18A.

[0236] Incidentally, since the structure of the liquid crystal displaymodule of the present embodiment is also the same as the liquid crystaldisplay module shown in FIG. 1, in FIGS. 18A and 18B, only portionsrelating to a fitting screw 120 are shown, and the other structure isomitted.

[0237] In the present embodiment, a hole 4 c through which the fittingscrew 120 passes is provided in a frame 4, the leaf spring nut 50 isfitted to the back (side wall of a mold 14) side of the hole 4 c bywelding or the like, and the fitting screw 120 is screwed to the leafspring nut 50.

[0238] In the embodiment, although the leaf spring nut 50 is provided atupper and lower places of the hole 4 c of the frame 4, this may beprovided at right and left places of the hole 4 c, or may be provided soas to surround the hole 4 c.

[0239] The present embodiment facilitates fitting of the leaf spring nut50 to the frame 4, and is able to prevent the leaf spring nut 50 frombeing dropped off in an assembling process of the liquid crystal displaymodule and to improve work efficiency.

[0240] [Embodiment 14]

[0241] In the liquid crystal display module shown in FIG. 1, althoughthe driving circuit board 3 is arranged at the rear side (rear side ofthe mold 14) of the backlight unit, in order to further reduce thethickness of the liquid crystal display module, as shown in FIG. 19, itis effective to arrange the driving circuit board 3 between the liquidcrystal display panel 5 and the side wall of the mold 14. In the casewhere the liquid crystal display module is in an active matrix drivingsystem, a driving circuit (semiconductor integrated circuit device) forsupplying a scanning signal or a video signal to a liquid crystaldisplay element is mounted on the driving circuit board, or a wiringline for supplying a signal or driving power to the driving circuit isformed thereon. In the ease where the liquid crystal display module isin a passive matrix driving system, a driving circuit for supplying acommon signal or a segment signal to a liquid crystal display element ismounted on the driving circuit board or a wiring line for supplying asignal or driving power to the driving circuit is formed thereon.

[0242]FIG. 19 is a schematic sectional view showing the sectionalstructure of the liquid crystal display module which is made thin, andFIG. 19 shows a sectional structure obtained by cutting in the samedirection as the extending direction of the cold-cathode fluorescentlamp 16.

[0243] Further, FIG. 19 shows diffusion sheets 6, 8 and two lens sheets7 together as an optical element 15.

[0244] However, in the liquid crystal display module shown in FIG. 19,since the driving circuit board 3 is arranged on the side wall of themold 14, for example, as in the embodiment 12, in the case where thefitting screw 120 is screwed to the tapped hole 120 a provided in theframe 4, there is a problem that a portion of the fitting screw 120protruding from the tapped hole 120 a to the mole side interferes withthe driving circuit board 3.

[0245] In order to solve this problem, although there is a method inwhich the picture frame region of the liquid crystal display module iswidened so that the fitting screw 120 does not interfere with thedriving circuit board 3, in this case, both the reduction in pictureframe width and the reduction in thickness can not be achieved.

[0246] The liquid crystal display device of the embodiment 14 of thepresent invention resolves such situations as mentioned previously byfeatures thereof which will be described as follows.

[0247] <Feature of a TFT System Liquid Crystal Display Module ofEmbodiment 14 of the Present Invention>

[0248]FIG. 20 is a plan view conceptually showing a plane shape of adriving circuit board of a liquid crystal display module of embodiment14 of the present invention in a thickness direction of the liquidcrystal display module.

[0249] Incidentally, since the structure of the liquid crystal displaymodule of the present embodiment is the same as the liquid crystaldisplay module shown in FIG. 19, in FIG. 20, only portions relating to afitting screw 120 are shown, and illustration of the other structure isomitted.

[0250] As is apparent from FIG. 20, in the present embodiment, a notch(concave portion) 3 a is formed in a driving circuit board 3 from an endportion facing a frame 4 to prevent interference between a tip of thefitting screw 120 protruding from a tapped hole 120 a and the drivingcircuit board 3.

[0251] By this, the present embodiment is able to further reduce thethickness of the liquid crystal display module.

[0252] Incidentally, in FIG. 20, although the description has been givenof the ease where the fitting screw 120 is screwed to the tapped hole 4b provided in the frame 4, the present invention can also be applied tothe case where the fitting screw 120 is screwed to the insert 13embedded in the mold 14, or the nut such as the plate nut fixed to themold 14 or the ridged nut.

[0253] Supposing the fitting screw 120 and the driving circuit board 3are arranged at different positions (heights) in the thickness directionof the liquid crystal display module, and the fitting screw 20 isprojected to the concave portion 3 a of the driving circuit board 3 inthis thickness direction as shown in FIG. 20, as in the embodiment 1,the interference between the upper protruded portion (14 a of FIG. 4) ofthe portion where the insert 13 of the mold 14 is provided and thedriving circuit board 3 can be avoided by the formation of the concaveportion 3 a.

[0254] When the example like this is supposed, even in the embodiments 4to 10 in which the upper surface is suppressed by using the plate nut orthe like, the interference between the upper surface of this plate nutand the driving circuit board 3 can also be avoided by the formation ofthe concave portion 3 a.

[0255] [Embodiment 15]

[0256] <Feature of a TFT System Liquid Crystal Display Module ofEmbodiment 15 of the Present Invention>

[0257]FIGS. 21A and 21B are views for explaining a shape of a drivingcircuit board of a liquid crystal display module of embodiment 15 of thepresent invention, FIG. 21A is a plan view showing the relation among afitting screw 120, a frame 4, and a driving circuit board 3, and FIG.21B is a main portion sectional view showing the relation among thefitting screw 120, the frame 4, and the driving circuit board 3.

[0258] Incidentally, since the structure of the liquid crystal displaymodule of the present embodiment is the same as the liquid crystaldisplay module shown in FIG. 19, in FIGS. 21A and 21B, only portionsrelating to the fitting screw 120 are shown, and the other structure isomitted.

[0259] As is apparent from FIG. 21A, in the present embodiment, thedriving circuit board 3 is divided in two, the fitting screw 120 isentered a divided portion, the two divided driving circuit boards areconnected by a flexible wiring board 3 b, and by this, the interferencebetween the fitting screw 120 and the driving circuit board 3 isprevented.

[0260] Accordingly, the present embodiment is also able to furtherreduce the thickness of the liquid crystal display module.

[0261] Incidentally, in FIGS. 21A and 21B, although the description hasbeen given of the case where the fitting screw 120 is screwed to thetapped hole 4 b provided in the frame 4, the present invention can beapplied also to the ease where the fitting screw 120 is screwed to theinsert 13 embedded in the mold 14, or the nut such as the plate nutfixed to the mold 14 or the ridged nut.

[0262] Incidentally, in the aforementioned respective embodiments,although the description has been mainly given of the embodiments inwhich the present invention is applied to the TFT system liquid crystaldisplay module, it is needless to say that the present invention canalso be applied to an STN system liquid crystal display module.

[0263] In the foregoing, although the present invention made by thepresent inventor has been specifically described on the basis of theembodiments, the present invention is not limited to the embodiments,but can be naturally variously modified in the scope not departing fromthe gist.

[0264] Typical effects obtained by the present invention disclosed inthe present application are briefly explained as follows:

[0265] (1) According to the liquid crystal display device of the presentinvention, the screw member to which the fitting screw for fixing theliquid crystal display device to the exterior case is screwed, can besimply and certainly fitted.

[0266] (2) According to the liquid crystal display device of the presentinvention, the screw mechanism of the fitting screw for fixing theliquid crystal display device to the exterior case can be simplified.

[0267] (3) According to the liquid crystal display device of the presentinvention, the thickness of the liquid crystal display device can bereduced.

[0268] (4) According to the liquid crystal display device of the presentinvention, the picture frame width of the liquid crystal display devicecan be reduced.

[0269] While we have shown and described several embodiments inaccordance with the present invention, it is understood that the same isnot limited thereto but is susceptible of numerous changes andmodifications as known to those skilled in the art, and we therefore donot wish to be limited to the details shown and described herein butintend to cover all such changes and modifications as are encompassed bythe scope of the appended claims.

What is claimed is:
 1. A liquid crystal display device comprising: aliquid crystal display element; a frame member having a frame-shapedpart which is arranged at a displaying surface side of the liquidcrystal display element and having a display window exposing adisplaying surface of the liquid crystal display element, the framemember having a side wall which extends from the frame-shaped part alonga thickness direction of the liquid crystal display element; a lightsource which is arranged opposite to another surface of the liquidcrystal display element opposite to the displaying surface thereof, thelight source irradiating the another surface of the liquid crystaldisplay element with illumination light; and a housing member having amain surface opposite to the frame-shaped part of the frame member and aside wall formed at a periphery of the main surface thereof, the housingmember housing the light source therein; wherein the frame member isfixed to the housing member so as to cover the main surface of thehousing member with the frame-shaped part of the frame member while anouter surface of the side wall of the housing member is covered with aninner surface of the side wall of the frame member; wherein a nut memberhaving a tapped hole is fixed to the housing member by a first screwwhich is screwed to the housing member, the tapped hole is positioned inthe outer surface of the side wall of the housing member, and wherein asecond screw is screwed into the tapped hole in a direction transverseto the thickness direction of the liquid crystal display element andfixes the liquid crystal display device to an exterior case, the firstscrew being covered with the frame member.
 2. A liquid crystal displaydevice according to claim 1, wherein the frame member has an openingformed at a part of the side wall thereof, and the second screw isscrewed to the tapped hole of the nut member through the opening.
 3. Aliquid crystal display device according to claim 1, wherein the housingmember has an opening formed at a part of the side wall thereof which isopposite to the tapped hole of the nut member.
 4. A liquid crystaldisplay device according to claim 1, wherein the frame member is made ofmetal and the housing member is molded of resin material.
 5. A liquidcrystal display device according to claim 1, wherein the housing memberhas another tapped hole formed at a part of the side wall thereof, andthe first screw is screwed to the another tapped hole.
 6. A liquidcrystal display device comprising: a liquid crystal display element; aframe member having a frame-shaped part which is arranged at adisplaying surface side of the liquid crystal display element and havinga display window exposing a displaying surface of the liquid crystaldisplay element, and a side wall which extends from the frame-shapedpart along a thickness direction of the liquid crystal display element;a light source which is arranged opposite to another surface of theliquid crystal display element which is opposite to the displayingsurface thereof, the light source irradiating the another surface of theliquid crystal display element with illumination light; and a housingmember having a main surface opposite to the frame-shaped part of theframe member and a side wall formed at a periphery of the main surfacethereof, the housing member housing the light source therein; wherein anut member having a tapped hole is provided at the side wall of thehousing member, the tapped hole being positioned in an outer surface ofthe side wall of the housing member; wherein the housing member has ahollow formed in the main surface thereof where a part of the nut memberis inserted in the thickness direction of the liquid crystal displayelement; wherein the frame member is fixed to the housing member so asto cover the main surface of the housing member with the frame-shapedpart of the frame member and fixes the nut member to the side wall ofthe housing member; and wherein a screw is screwed into the tapped holeof the nut member in a direction transverse to the thickness directionof the liquid crystal display element and fixes the liquid crystaldisplay device to an exterior case.
 7. A liquid crystal display deviceaccording to claim 6, wherein the side wall of the frame member coversthe outer surface of the side wall of the housing member, the side wallof the frame member having an opening exposing the tapped hole of thenut member.
 8. A liquid crystal display device according to claim 6,wherein the nut member has a protruded portion protruded toward the sidewall of the frame member with respect to the part of the nut memberwhich is inserted in the hollow of the housing member, the tapped holebeing formed at the protruded portion of the nut member.
 9. A liquidcrystal display device according to claim 6, wherein the frame member ismade of metal and the housing member is molded of resin material.